小麦半旱栽培体系中土壤的容积含水量高于旱作土壤0.8—1.0倍以上,土壤的稳温力强,供氮能力提高。在抽穗以前,半旱栽培土壤对植株吸氮和营养体的建造是有利的。但是,在抽穗以后,植株体内进入以碳代谢为主的生长阶段,则不利于植株体内的糖分合成和籽粒中淀粉的累积。因此,在抽穗以后应尽力排除垄沟内的积水,提高土壤温差是小麦半旱栽培夺取高产的关键环节。 The volumetric water content of soil in semi-arid wheat cultivation system was higher than that of arid soil by 0.8-1.0 times, the soil temperature stability was strong and the nitrogen supply capacity was increased. Prior to heading, semi-arid cultivated soil was beneficial for plant nitrogen uptake and vegetative body building. However, after the heading stage, the plants enter the growth stage mainly of carbon metabolism, which is not conducive to the sugar synthesis in the plants and the accumulation of starch in the grains. Therefore, after earring should try to rule out the water within the furrows and improve soil temperature is the key to wheat semi-arid cultivation to seize high yield.